Sewing & Pattern making Terms

Sew-in interfacing

As a seamstress or pattern maker, achieving the desired structure and stability in your garments is crucial. One indispensable tool in your arsenal is sew-in interfacing. This versatile material is used to reinforce and support fabric, adding structure, shape and durability to various sewing projects. In this comprehensive guide, we will explore sew-in interfacing, its benefits, and how to effectively incorporate it into your sewing creations.

What is Sew-In Interfacing?

Sew-in interfacing is a type of stabilizing material that is sewn directly into the fabric. It comes in various weights, textures and compositions to suit different fabrics and applications.

Benefits of Sew-In Interfacing

  1. Structure and Support:
  • Sew-in interfacing provides added strength and support to fabric, particularly in areas that require stability, such as collars, cuffs, and waistbands.
  • It helps garments maintain their intended shape and structure, enhancing the overall fit and appearance.
  1. Versatility:
  • Sew-in interfacing can be used with a wide range of fabrics, including lightweight and delicate materials.
  • It allows you to customize the level of reinforcement based on the specific needs of your project.
  1. Breathability:
  • Unlike some fusible interfacings that can restrict breathability, sew-in interfacing allows air circulation, making it suitable for garments that require ventilation, such as shirts or dresses.
  1. Easy Adjustments:
  • Sew-in interfacing can be easily removed or replaced, allowing for adjustments during the fitting process.
  • It provides flexibility in modifying the level of support or shape without permanently altering the fabric.

Types of Sew-In Interfacing

  1. Woven Interfacing:

Woven sew-in interfacing is made from tightly woven fibers and is compatible with a variety of fabrics. It adds structure and stability while remaining flexible.

  1. Non-Woven Interfacing:

Non-woven sew-in interfacing is created by bonding fibers together without weaving. It is often used for lightweight fabrics and adds stability without excessive bulk.

  1. Knit Interfacing:

Knit sew-in interfacing is designed specifically for stretch fabrics. It provides support while allowing the fabric to retain its stretch and drape.

Incorporating Sew-In Interfacing into Your Sewing Projects

  1. Selection:
  • Choose the appropriate weight and type of sew-in interfacing based on your fabric and desired outcome.
  • Consider the specific areas of your garment that require reinforcement.
  1. Preparation:
  • Pre-wash and pre-shrink both the fabric and interfacing before cutting and sewing.
  • Follow the manufacturer’s instructions for care and handling.
  1. Cutting and Applying:
  • Cut the interfacing pieces according to the pattern instructions, typically smaller than the fabric pieces they will reinforce.
  • Pin or baste the interfacing to the wrong side of the fabric, aligning the edges and following the pattern markings.
  1. Stitching:
  • Sew the fabric and interfacing together, treating them as one layer.
  • Use appropriate stitches and techniques based on the fabric and desired seam finish.
  1. Finishing:
  • Trim any excess interfacing from seam allowances to reduce bulk and allow for smooth seam construction.
  • Press the interfaced areas carefully to set the stitches and meld the layers together.

Care and Maintenance

  • Sew-in interfacing generally requires the same care as the fabric it is applied to.
  • Follow the garment’s care instructions to ensure longevity and maintain the desired structure.


Sew-in interfacing is a valuable tool that empowers seamstresses and pattern makers to achieve professional-looking garments with enhanced structure and stability. By understanding its benefits, selecting the appropriate type and skillfully incorporating it into your projects, you can elevate your sewing skills and create garments that are both functional and aesthetically pleasing. Experiment with different weights and techniques to master the art of sew-in interfacing and unlock endless possibilities in your sewing journey.

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Melissa Villegas
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